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crypto: qat - fix state restore for banks with exceptions

Message ID 20250604160006.56369-1-giovanni.cabiddu@intel.com
State New
Headers show
Series crypto: qat - fix state restore for banks with exceptions | expand

Commit Message

Giovanni Cabiddu June 4, 2025, 3:59 p.m. UTC 
From: Svyatoslav Pankratov <svyatoslav.pankratov@intel.com>

Change the logic in the restore function to properly handle bank
exceptions.

The check for exceptions in the saved state should be performed before
conducting any other ringstat register checks.
If a bank was saved with an exception, the ringstat will have the
appropriate rp_halt/rp_exception bits set, causing the driver to exit
the restore process with an error. Instead, the restore routine should
first check the ringexpstat register, and if any exception was raised,
it should stop further checks and return without any error. In other
words, if a ring pair is in an exception state at the source, it should
be restored the same way at the destination but without raising an error.

Even though this approach might lead to losing the exception state
during migration, the driver will log the exception from the saved state
during the restore process.

Signed-off-by: Svyatoslav Pankratov <svyatoslav.pankratov@intel.com>
Fixes: bbfdde7d195f ("crypto: qat - add bank save and restore flows")
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
---
 .../intel/qat/qat_common/adf_gen4_hw_data.c   | 29 ++++++++++++++-----
 1 file changed, 22 insertions(+), 7 deletions(-)
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Patch

diff --git a/drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c b/drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c
index 0406cb09c5bb..14d0fdd66a4b 100644
--- a/drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c
+++ b/drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c
@@ -581,6 +581,28 @@  static int bank_state_restore(struct adf_hw_csr_ops *ops, void __iomem *base,
 	ops->write_csr_int_srcsel_w_val(base, bank, state->iaintflagsrcsel0);
 	ops->write_csr_exp_int_en(base, bank, state->ringexpintenable);
 	ops->write_csr_int_col_ctl(base, bank, state->iaintcolctl);
+
+	/*
+	 * Verify whether any exceptions were raised during the bank save process.
+	 * If exceptions occurred, the status and exception registers cannot
+	 * be directly restored. Consequently, further restoration is not
+	 * feasible, and the current state of the ring should be maintained.
+	 */
+	val = state->ringexpstat;
+	if (val) {
+		pr_info("QAT: Bank %u state not fully restored due to exception in saved state (%#x)\n",
+			bank, val);
+		return 0;
+	}
+
+	/* Ensure that the restoration process completed without exceptions */
+	tmp_val = ops->read_csr_exp_stat(base, bank);
+	if (tmp_val) {
+		pr_err("QAT: Bank %u restored with exception: %#x\n",
+		       bank, tmp_val);
+		return -EFAULT;
+	}
+
 	ops->write_csr_ring_srv_arb_en(base, bank, state->ringsrvarben);
 
 	/* Check that all ring statuses match the saved state. */
@@ -614,13 +636,6 @@  static int bank_state_restore(struct adf_hw_csr_ops *ops, void __iomem *base,
 	if (ret)
 		return ret;
 
-	tmp_val = ops->read_csr_exp_stat(base, bank);
-	val = state->ringexpstat;
-	if (tmp_val && !val) {
-		pr_err("QAT: Bank was restored with exception: 0x%x\n", val);
-		return -EINVAL;
-	}
-
 	return 0;
 }